B4J Question cosine similarity of 2 vectors

[peacemaker]

Hi, All

Any example of comparing two Arrays As float (0.0, 0.1, 0.2) ?

 

[DonManfred]

How do I calculate the cosine similarity of two vectors?

How do I find the cosine similarity between vectors? I need to find the similarity to measure the relatedness between two lines of text. For example, I have two sentences like: system for user int...

stackoverflow.com

 

[peacemaker]

Yes, solved:

Sub Vectors_Similarity(v1() As Float, v2() As Float) As Float
    If v1.Length <> v2.Length Then Return 0.0
    Dim dotProduct As Double = 0.0
    Dim normA As Double = 0.0
    Dim normB As Double = 0.0
    
    For i = 0 To v1.Length - 1
        dotProduct = dotProduct + v1(i) * v2(i)
        normA = normA + Power(v1(i), 2)
        normB = normB + Power(v2(i), 2)
    Next
    Dim res As Double = dotProduct / (Sqrt(normA) * Sqrt(normB))
    Return res.As(Float)
End Sub

 

[peacemaker]

But if to compare 2 zero vectors - deleting to zero will give NaN